Question about Optoma LFU250E Projector Lamp for H77,H79

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My Optoma H77 is great, but over the past month a shadow has been creeping in on the left side of the widescreen. It is not a straight line - wider at the top than bottom and is about 50% transparent. It has been getting wider and is now about 15% of the screen width, and the first 25% of the shadow is almost opaque. Other than that the projector works great, and has for years. Ideas? I tried to take the cover off, but I will need to get a specific type of hex driver.

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  • tmunro Sep 04, 2010

    yes, thank you



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Either one of the mirrors in the light tunnel has collapsed, or there is a foreign object in front of the lens. The mirror problem is more common.

Here the same problem explained on rear projection TV, it works more or less in the same way on a projector like your Optoma:rear projection TV is displaying a darker shadow on

Posted on Sep 04, 2010


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Unfortunately, a cinema screen is even wider than a widescreen TV. Because of this (in order to keep the original aspect ratio), even with a widescreen TV you still end up with the black bars top and bottom.

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The projector was 20 days past warranty, and the company would not honor. So much for customer satisfaction and loyalty. Last piece of Optoma equipment I will ever buy!


Anyway, I found a web item on another model of Optoma projector with the same problem. The solution this guy tried was -- I kid you not -- rapping on the thing. With nothing to lose, I tried this on mine. Tapped lightly on the top and noticed a change in the width of the line. Hmmm ... it was sensitive to this.


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